Update libmetal 2018.10 recipe to the use 2018.10 tag
Update libmetal 2018.10 recipe to the use 2018.10 tag

Signed-off-by: Wendy Liang <3b5b00198ad7f132308f5f249afae9e1b816a404@xilinx.com>

OpenAMP/meta-openamp,OpenAMP/meta-openamp